5481991 has 4 divisors (see below), whose sum is σ = 5508184. Its totient is φ = 5455800.

The previous prime is 5481989. The next prime is 5482019. The reversal of 5481991 is 1991845.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1991845 = 5 ⋅398369.

It is a cyclic number.

It is not a de Polignac number, because 5481991 - 2¹ = 5481989 is a prime.

It is a Duffinian number.

5481991 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 5481991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5481961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12780 + ... + 13201.

It is an arithmetic number, because the mean of its divisors is an integer number (1377046).

Almost surely, 2^5481991 is an apocalyptic number.

5481991 is a deficient number, since it is larger than the sum of its proper divisors (26193).

5481991 is a wasteful number, since it uses less digits than its factorization.

5481991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26192.

The product of its digits is 12960, while the sum is 37.

The square root of 5481991 is about 2341.3652000489. The cubic root of 5481991 is about 176.3245453656.

The spelling of 5481991 in words is "five million, four hundred eighty-one thousand, nine hundred ninety-one".